* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  .myhead {
    background-color: #0b87ff;
    text-align: center;
    padding: 5px 0px 10px 0px;
    color: aliceblue;
  }
  
  .myhead .box {
    margin-top: 10px;
    display: flex;
    gap: 5px;
    justify-content: center;
  }
  
  .thing {
    width: 300px;
    height: 30px;
    padding: 0 10px;
    border-radius: 3px;
    outline: none;
    border: solid 1px white;
  }
  
  .add {
    display: inline-block;
    width: 80px;
    height: 30px;
    background-color: #eee;
    color: #0b87ff;
    line-height: 30px;
    border: none;
    border-radius: 3px;
  }
  
  .add:hover {
    cursor: pointer;
    background-color: #fff;
    color: #ff6700;
  }
  

  /* 设置关闭按钮的样式 */
  
  .close:hover {
    background-color: #f44336;
    color: white;
  }